annualWATER Quality REPORT REPORTING YEAR 2019

Presented By Crescenta Valley Este informe contiene información muy importante sobre su agua potable. Tradúzcalo o Water District hable con alguien que lo entienda bien.

PWS ID#: 1910028 Our Mission Our Mission Continues he mission of the Crescenta Valley Water District is to e are pleased to present our 2019 annual water Tprovide quality water and wastewater services to the Wquality report covering all testing performed Crescenta Valley community in a dependable and economically between January 1 and December 31, 2019. Over responsible manner. the years, we have dedicated ourselves to producing drinking water that meets all State and Federal Your Agency: At a Glance standards. We continually strive to adopt new methods CVWD provides approximately 33,000 customers with water for delivering the best-quality drinking water to you. and wastewater service through more than 8,300 connections. As new challenges to drinking water safety emerge, The District has been serving the areas of La Crescenta, we remain vigilant in meeting the goals of source Montrose, and portions of Glendale and La Cañada since 1950. water protection, water conservation, and community education while continuing to serve the needs of all our The District maintains 95 miles of pipelines, 12 wells, 17 water users. reservoirs, 34 booster pumps, 651 fire hydrants, stationary and mobile electrical generators, and emergency water Please remember that we are always available should interconnections to neighboring water agencies, ensuring a you ever have any questions or concerns about your ready water supply whether it’s for washing dishes or putting water. out a fire. In 2019, approximately 52% of CVWD’s source water came from local groundwater supply in the Verdugo Basin. The majority of CVWD’s groundwater wells are Public Meetings located along the Verdugo Wash, south of Honolulu he District is governed by a five-member Board Avenue. This is an increase over last year’s groundwater Tof Directors, elected at-large, who meet the production, as water levels in the Verdugo Basin are 2nd and 4th Tuesdays of each month at CVWD’s starting to recover from levels that reached an all- Administration Office. Public input is encouraged. time historic low following what was one of the worst Information regarding the District’s Board meetings droughts on record, with 2011-2014 being the driest and upcoming events can be found on the period in since record keeping started. Local District Website at www.cvwd.com. rainfall can take up to three years to reach the aquifer. In addition, the community is encouraged to attend The remaining 48% of CVWD’s source water came from special meetings such as budget workshops, strategic imported surface water supplied by Foothill Municipal Water planning sessions, and rate hearings, which District (FMWD), which is a member agency to Metropolitan are advertised and posted on the District’s Website Water District of (MWD). MWD and at the District’s Administration Office at 2700 supplies surface water from the State Water Project in Northern Foothill Blvd. California and the Colorado River via the Colorado River Aqueduct, which carries water 242 miles from Lake Havasu to At the time of this report, all CVWD meetings Lake Mathews in Riverside, CA. are virtual. Pursuant to the provisions of Executive Order N-29-20 issued by Governor Gavin Newsom The District supplied approximately 1.2 billion gallons of water on March 18, 2020, the public may not attend the in the 2019 calendar year. This amount was relatively the same meetings in person. Any member of the public may as the previous two years. participate in CVWD meetings by using a touch-tone In an emergency, an interconnection between CVWD and phone or by utilizing Zoom teleconferencing. Please the City of Glendale can be used to supply water to District check www.cvwd.com for the latest updates. customers. The District also has an interconnection with the Department of Water and Power. This connection has been constructed and tested. It will further ensure the reliability of the District’s water system.

Important Health Information ome people may be more vulnerable to contaminants in drinking water than the general population. SImmunocompromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants may be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. The U.S. EPA/CDC (Centers for Disease Control and Prevention) guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline at (800) 426-4791 or http://water.epa.gov/drink/hotline. Substances That Could Be in Source Water Assessment Water he Crescenta Valley Water District’s water system he sources of drinking water (both tap Tis located in Los Angeles County and serves the Twater and bottled water) include rivers, residents of the City of La Crescenta and portions of lakes, streams, ponds, reservoirs, springs, and Glendale, Montrose, and La Canada-Flintridge. There are wells. As water travels over the surface of 8,054 metered service connections serving a population of the land or through the ground, it dissolves approximately 33,000. naturally occurring minerals and, in some The drinking water sources for the Crescenta Valley County cases, radioactive material, and can pick up Water District water system are: Wells 01, 02, 05, 06, substances resulting from the presence of 07, 08, 09, 10, 11, 12, 14, 15, 16, and Pickens Tunnel, animals or from human activity. located between the and San Gabriel In order to ensure that tap water is safe to Mountains, in Crescenta Valley. The mountainous, rural recharge area is drink, the U.S. Environmental Protection generally located to the south side of the , and to the Agency (U.S. EPA) and the State Water north side of the Verdugo Mountains, channeling to the Crescenta Valley. Resources Control Board (State Board) The local groundwater within the Verdugo Basin has historically contained prescribe regulations that limit the amount levels of tetrachloroethylene (PCE) at concentrations that have varied over of certain contaminants in water provided the last 20 years. PCE levels were detected in the early 1980’s and have by public water systems. The U.S. Food been monitored by the Crescenta Valley Water District (CVWD) and the and Drug Administration regulations and United States Environmental Protection Agency (U.S. EPA) since 1981. California law also establish limits for The initial findings showed that the levels were above the 5 ug/L contaminants in bottled water that provide maximum contaminant level (MCL) as established by the U.S. EPA the same protection for public health. and the State Water Resources Control Board, Division of Drinking Drinking water, including bottled water, Water (SWRCB). The increased levels may be due to dry cleaning and may reasonably be expected to contain at auto shop businesses using existing septic systems that discharge to the least small amounts of some contaminants. groundwater table. In the early 1980s, CVWD constructed a sewer The presence of contaminants does not system and eliminated the septic systems. Once the sewer system was in necessarily indicate that water poses a health place, the levels of PCE dramatically dropped within the Verdugo Basin. risk. The U.S. EPA started monitoring PCE levels as part of the Superfund Contaminants that may be present in source cleanup for the within the Verdugo Basin starting in water include: Microbial Contaminants, 1990. In 1998, the EPA declared that the PCE levels in the Verdugo Basin such as viruses and bacteria, that may come were below the MCL and no further action was required with respect to from sewage treatment plants, septic systems, the Superfund cleanup. agricultural livestock operations, and wildlife; Water from most of the wells have nitrate concentration above the Inorganic Contaminants, such as salts and MCL. Water from Well 14 is high in PCE. Water from Wells 01, 05, 07, metals, that can be naturally occurring or and 09 is pumped to the Mills Booster Station and blended with can result from urban stormwater runoff, imported water from the MWD connection at the Paschall Blending industrial or domestic wastewater discharges, Station. The volume of the produced water is based on the water level in oil and gas production, mining, or farming; Oak Creek Reservoir. All of the other wells, with the exception of Well 2 Pesticides and Herbicides, that may come Blend at the Glenwood Nitrate Treatment Plant. Well 2 is treated with a from a variety of sources such as agriculture, microbiological process to remove nitrate. urban stormwater runoff, and residential uses; Organic Chemical Contaminants, including The source is considered most vulnerable to the following synthetic and volatile organic chemicals, activities associated with contaminants detected in the water supply: that are by-products of industrial processes Dry cleaners; Known Contaminant Plumes. and petroleum production and can also The source is considered most vulnerable to the following activities come from gas stations, urban stormwater not associated with any detected contaminants: Sewer collection runoff, agricultural applications, and septic systems; Historic waste dumps/landfills. systems; Radioactive Contaminants, that can be naturally occurring or can be the result of A copy of the completed source water assessment may be viewed at oil and gas production and mining activities. the Drinking Water Field Operations Branch, 500 North Central Avenue, Suite 500, Glendale, CA 91203. You may request that a More information about contaminants and summary of the assessment be sent to you by contacting Chi Diep, P.E., potential health effects can be obtained by District Engineer, at (818) 551-2054. calling the U.S. EPA’s Safe Drinking Water Hotline at (800) 426-4791. Lead in Home Plumbing What’s a Cross-Connection? f present, elevated levels of lead can cause serious ross-connections Ihealth problems, especially for pregnant women and Cthat contaminate young children. Lead in drinking water is primarily from drinking water materials and components associated with service lines and distribution lines are home plumbing. We are responsible for providing high- a major concern. A quality drinking water, but we cannot control the variety cross-connection is of materials used in plumbing components. When your formed at any point water has been sitting for several hours, you can minimize where a drinking the potential for lead exposure by flushing your tap for water line connects 30 seconds to 2 minutes before using water for drinking to equipment (boilers), systems containing chemicals (air or cooking. (If you do so, you may wish to collect the conditioning systems, fire sprinkler systems, irrigation flushed water and reuse it for another beneficial purpose, systems), or water sources of questionable quality. Cross- such as watering plants.) If you are concerned about lead connection contamination can occur when the pressure in in your water, you may wish to have your water tested. the equipment or system is greater than the pressure inside Information on lead in drinking water, the drinking water line (backpressure). testing methods, and steps you can We remain vigilant in Contamination can also occur when take to minimize exposure is available delivering the best-quality the pressure in the drinking water line from the Safe Drinking Water Hotline drinking water drops due to fairly routine occurrences at (800) 426-4791 or at www.epa.gov/ (main breaks, heavy water demand), safewater/lead. causing contaminants to be sucked out from the equipment and into the drinking water line (backsiphonage). Outside water taps and garden hoses tend to be the most Treatment common sources of cross-connection contamination at home. The garden hose creates a hazard when submerged VWD is in a swimming pool or when attached to a chemical sprayer Crequired by for weed killing. Garden hoses that are left lying on the the State Water ground may be contaminated by fertilizers, cesspools, or Resources Control garden chemicals. Improperly installed valves in your toilet Board, Division of could also be a source of cross-connection contamination. Drinking Water (SWRCB) to test Community water supplies are continuously jeopardized its groundwater by cross-connections unless appropriate valves, known as for organic backflow prevention devices, are installed and maintained. chemicals, minerals, metals, and bacteria; and is also We have surveyed industrial, commercial, and institutional required to perform daily, weekly, and monthly tests facilities in the service area to make sure that potential cross- for bacteria, nitrates, and total Trihalomethanes in the connections are identified and eliminated or protected by distribution system. Lead and copper are tested in tap a backflow preventer. We also inspect and test backflow water from selected residences. MWD is responsible for preventers to make sure that they provide maximum water quality testing of their treated surface water. protection. Local groundwater is disinfected with chlorine before For more information on backflow prevention, contact the blending with MWD’s imported surface water. The Safe Drinking Water Hotline at (800) 426-4791. Verdugo Basin groundwater contains nitrates, which is likely due to old septic systems and historical agricultural practices in the Crescenta Valley. CVWD treats some of the groundwater through a nitrate removal process at CVWD’s Glenwood Facility, and at Well 2 using microbiological treatment. The remaining groundwater is Questions? blended with imported surface water to lower the nitrate levels below the Maximum Contaminant Level (MCL). For more information about this report, or for The blend of imported surface water and groundwater any questions relating to your drinking water, delivered to your residence depends upon where you live please contact Christy Colby at (818) 248-3925 in the community and the time of year. or email [email protected]. Test Results ur water is monitored for many different kinds of substances on a very strict sampling schedule. Also, the water we deliver must meet specific State and Federal health standards. Here, Owe show only those substances that were detected in our water. (A complete list of all our analytical results is available upon request.) Remember that detecting a substance does not mean the water is unsafe to drink; our goal is to keep all detects below their respective maximum allowed levels. The State recommends monitoring for certain substances less often than once per year because the concentrations of these substances do not change frequently. In these cases, the most recent sample data are included, along with the year in which the sample was taken. The District participated in the 4th stage of the U.S. EPA’s Unregulated Contaminant Monitoring Rule (UCMR4) program by performing additional tests on our drinking water. UCMR4 sampling benefits the environment and public health by providing the EPA with data on the occurrence of contaminants suspected to be in drinking water, in order to determine if the EPA needs to introduce new regulatory standards to improve drinking water quality. Unregulated contaminant monitoring data are available to the public, so please feel free to contact us if you are interested in obtaining that information. If you would like more information on the U.S. EPA’s Unregulated Contaminant Monitoring Rule, please call the Safe Drinking Water Hotline at (800) 426-4791.

REGULATED SUBSTANCES Imported Water from Crescenta Valley Water Metropolitan Water District’s District F.E. Weymouth Plant (MWD) PHG SUBSTANCE YEAR MCL (MCLG) AMOUNT RANGE AMOUNT RANGE (UNIT OF MEASURE) SAMPLED [MRDL] [MRDLG] DETECTED LOW-HIGH DETECTED LOW-HIGH VIOLATION TYPICAL SOURCE Aluminum (ppm) 2019 1 0.6 ND NA 0.122 ND–0.122 No Erosion of natural deposits; residue from some surface water treatment processes Arsenic (ppb) 2019 10 0.004 0.10 ND–4.4 ND NA No Erosion of natural deposits; runoff from orchards; glass and electronics production wastes Barium (ppm) 2019 1 2 0.106 ND–0.130 ND NA No Discharges of oil drilling wastes and from metal refineries; erosion of natural deposits Bromate (ppb) 2019 10 0.1 NA NA 1.91 ND–8.1 No By-product of drinking water disinfection Control of DBP precursors 2019 TT NA NA NA 2.4 1.7–2.6 No Various natural and man-made sources [TOC] (Units) Fluoride (ppm) 2019 2.0 1 0.442 0.22–0.58 0.73 0.1–0.9 No Erosion of natural deposits; water additive that promotes strong teeth; discharge from fertilizer and aluminum factories Gross Alpha Particle Activity 2016 15 (0) 4.74 3.3–6.6 ND5 NA5 No Erosion of natural deposits (pCi/L) Haloacetic Acids (ppb) 2019 60 NA 11.6 4.0–22.0 96 ND–13 No By-product of drinking water disinfection Nitrate [as nitrate] (ppm) 2019 45 45 207 5.1–37 ND NA No Runoff and leaching from fertilizer use; leaching from septic tanks and sewage; erosion of natural deposits TTHMs [Total 2019 80 NA 49.3 25–82 28 12–56 No By-product of drinking water disinfection Trihalomethanes]8 (ppb) Tetrachloroethylene [PCE] (ppb) 2019 5 0.06 0.457 ND–0.88 ND NA No Discharge from factories, dry cleaners, and auto shops (metal degreaser) Turbidity (NTU) 2019 TT NA NA NA 1009 0.05–100 No Soil runoff Uranium (pCi/L) 2016 20 0.43 3.8 1.2–6.8 ND NA No Erosion of natural deposits Tap water samples were collected for lead and copper analyses from sample sites throughout the community.

AMOUNT SITES ABOVE SUBSTANCE YEAR PHG DETECTED AL/TOTAL (UNIT OF MEASURE) SAMPLED AL (MCLG) (90TH %ILE) SITES VIOLATION TYPICAL SOURCE Copper (ppm) 2017 1.3 0.3 0.206 0/34 No Internal corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives Lead (ppb) 2017 15 0.2 2.2 0/34 No Internal corrosion of household water plumbing systems; discharges from industrial manufacturers; erosion of natural deposits SECONDARY SUBSTANCES Imported Water from Crescenta Valley Water Metropolitan Water District’s District F.E. Weymouth Plant (MWD) SUBSTANCE YEAR PHG AMOUNT RANGE AMOUNT RANGE (UNIT OF MEASURE) SAMPLED SMCL (MCLG) DETECTED LOW-HIGH DETECTED LOW-HIGH EXCEEDANCE TYPICAL SOURCE Aluminum10 (ppb) 2019 200 NS ND NA 12211 ND–11011 No Erosion of natural deposits; residual from some surface water treatment processes Chloride (ppm) 2019 500 NS 75 8–87 50 46–55 No Runoff/leaching from natural deposits; seawater influence Color (Units) 2019 15 NS 1 1–1 ND ND–1 No Naturally occurring organic materials Corrosivity12 (Units) 2019 Non-corrosive NS NA NA 12.2 12.1–12.2 No Natural or industrially influenced balance of hydrogen, carbon, and oxygen in the water; affected by temperature and other factors Iron (ppb) 2019 300 NS ND NA 243 243–243 Yes Leaching from natural deposits; industrial wastes Manganese (ppb) 2019 50 NS ND NA 12 11–12 No Leaching from natural deposits Odor–Threshold (Units) 2019 3 NS ND ND–1.0 113 1–1 No Naturally occurring organic materials Specific Conductance (µS/cm) 2019 1,600 NS 805 343–884 469 435–503 No Substances that form ions when in water; seawater influence Sulfate (ppm) 2019 500 NS 102 27–120 73 65–81 No Runoff/leaching from natural deposits; industrial wastes Total Dissolved Solids (ppm) 2019 1,000 NS 527 210–580 26614 244–286 No Runoff/leaching from natural deposits Turbidity (Units) 2019 5 NS 0.1415 0.07–1.0 0.049 ND–100 No Soil runoff UNREGULATED SUBSTANCES 19 Imported Water from Metropolitan Water Crescenta Valley Water District District’s F.E. Weymouth Plant (MWD)

SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED AMOUNT DETECTED RANGE LOW-HIGH AMOUNT DETECTED RANGE LOW-HIGH TYPICAL SOURCE Boron (ppb) 2019 6 ND–110 120 120–120 Runoff/leaching from natural deposits; industrial wastes Chloroform (ppb) 2019 0.8 ND–2.0 NA16 NA16 By-product of drinking water disinfection N-Nitrosodimethylamine [NDMA] (ppt) 20185 NA NA 4.0 ND–4.0 By-product of drinking water chloramination; industrial processes Sodium (ppm) 2019 34 17–38 50 46–54 Runoff/leaching from natural deposits; seawater influence Vanadium (ppb) 2019 5.0 4.1–6.9 ND NA Erosion of natural deposits UNREGULATED AND OTHER SUBSTANCES 17 Definitions Imported Water from 90th %ile: The levels reported for ND (Not detected): Indicates that Metropolitan Water lead and copper represent the 90th the substance was not found by Crescenta Valley Water District’s F.E. Weymouth percentile of the total number of laboratory analysis. District Plant (MWD) sites tested. The 90th percentile NS: No standard SUBSTANCE YEAR AMOUNT RANGE AMOUNT RANGE is equal to or greater than 90% of (UNIT OF MEASURE) SAMPLED DETECTED LOW-HIGH DETECTED LOW-HIGH TYPICAL SOURCE our lead and copper detections. NTU (Nephelometric Turbidity Alkalinity (ppm) 2019 157 120–180 68 67–70 Naturally occurring AL (Regulatory Action Units): Measurement of the clarity, or turbidity, of water. Turbidity in Calcium (ppm) 2019 82 38–95 25 23–27 Naturally occurring Level): The concentration of a contaminant that, if exceeded, excess of 5 NTU is just noticeable Chlorate (ppb) 2019 NA NA 42 42–42 By-product of drinking triggers treatment or other to the average person. water chlorination; industrial requirements that a water system pCi/L (picocuries per liter): processes A must follow. measure of radioactivity. Hardness as CaCO318 (ppm) 2019 329 150–370 108 101–116 Leaching from natural deposits MCL (Maximum Contaminant PDWS (Primary Drinking Water Magnesium (ppm) 2019 30 13–33 12 11–12 Naturally occurring Level): The highest level of a Standard): MCLs and MRDLs Potassium (ppm) 2019 3.3 2.5–4.0 2.4 2.2–2.7 Naturally occurring contaminant that is allowed in for contaminants that affect health drinking water. Primary MCLs 7 7 along with their monitoring and pH (Units) 2018 7.71 7.20–8.10 8.5 8.5–8.5 Naturally occurring are set as close to the PHGs (or reporting requirements, and water MCLGs) as is economically and treatment requirements. 1 Compliance with the State and Federal 8 Some people who drink water containing 14 Metropolitan’s TDS compliance data are technologically feasible. Secondary bromate MCL is based on RAA. No MCL trihalomethanes in excess of the MCL over based on flow-weighted monthly composite MCLs (SMCLs) are set to protect PHG (Public Health Goal): The exceedance occurred in the Weymouth many years may experience problems with samples collected twice per year (April and the odor, taste and appearance of level of a contaminant in drinking treatment plant effluent. their livers, kidneys, or central nervous October). The 12-month statistical summary of drinking water. water below which there is no 2 The results reported for fluoride are from systems, and may have an increased risk of flow-weighted data is reported in the “Other known or expected risk to health. samples collected within the CVWD’s getting cancer. Parameters” section under “Miscellaneous.” MCLG (Maximum Contaminant PHGs are set by the California distribution system and reflect fluoride values 9 MWD monitors turbidity at the CFE locations 15 Results are based on samples collected Level Goal): The level of a EPA. after the groundwater has been blended with using continuous and grab samples. Turbidity, withing the District’s distributions system. contaminant in drinking water ppb (parts per billion): imported water from MWD. a measure of cloudiness of the water, is an 16 Sampled in 2016 below which there is no known or One part 17 substance per billion parts water 3 MWD was in compliance with all provisions of indicator of treatment performance. Turbidity Unregulated contaminant monitoring helps expected risk to health. MCLGs the State’s fluoridation system requirements. was in compliance with the TT primary the U.S. EPA and the State Water Resources are set by the U.S. EPA. (or micrograms per liter). Fluoride feed systems were temporarily out drinking water standard and the secondary Control Board to determine where certain MRDL (Maximum Residual ppm (parts per million): One of service during treatment plant shutdowns drinking water standard of less than 5 NTU. contaminants occur and whether the Disinfectant Level): The highest part substance per million parts 10 and/or maintenance work in 2019, resulting in Compliance with the State MCL for aluminum contaminants need to be regulated. level of a disinfectant allowed water (or milligrams per liter). 18 occasional fluoride levels below 0.6 mg/L. is based on RAA. No secondary standard To convert the data from mg/L CaCO3 in drinking water. There is 4 The data collected is from 2016, with the MCL exceedance occurred in the Weymouth hardness to grains per gallons hardness, convincing evidence that addition ppt (parts per trillion): One part exception of Well 8, which was collected in treatment plant effluent. divide the average by 17.1 (329 / 17.1 = 19.2 of a disinfectant is necessary for substance per trillion parts water 11 2017, and Well 2, which was collected in 2019. Sampled in 2018 grains per gallon). control of microbial contaminants. (or nanograms per liter). 5 Data are from samples collected in 2017 for the 12 AI ≥ 12.0 = Non-aggressive water; AI 10.0–11.9 TT (Treatment Technique): required triennial monitoring (2017-2019) until = Moderately aggressive water; AI ≤ 10.0 = MRDLG (Maximum Residual A required process intended to the next samples are collected in the 2020 - Highly aggressive water. Reference: ANSI/ Disinfectant Level Goal): reduce the level of a contaminant 2022 compliance period.. AWWA Standard C400-93 (R98). The level of a drinking water in drinking water. 6 This data represents the treatment plant 13 Compliance with odor threshold secondary disinfectant below which there specific core locations per the State-approved MCL is based on Running Annual Average is no known or expected risk µS/cm (microsiemens per monitoring plan. (RAA). Treatment plants begin quarterly to health. MRDLGs do not centimeter): A unit expressing the 7 Results reported represent samples collected monitoring if annual monitoring results are reflect the benefits of the use of amount of electrical conductivity within the CVWD’s distribution system. above 3. disinfectants to control microbial of a solution. contaminants. NA: Not applicable